Overview
These are inexpensive, very small lever
switches that can be used to sense the position of an airbrake or flap
actuator or to sense that the landing gear is up or down and locked.
They can be wired as
either normally-open (no current flow when not activated, current flow
when activated) or normally-closed (current flow when not activated, no
current flow when activated). See dimensional drawing below for
wiring instructions. The switch is also labeled near the
connectors with "C" for common, "NO" for normally-open, and "NC" for
normally-closed. The connectors on the bottom of the switch are
"solder lugs" designed for soldering wires to.
Related Pages
- Hamlin -
Magnetic reed sensors
Terminology
- NO (Normally Open) -
current flow when activated, no current
flow when not activated
- NC (Normally Closed) -
no current flow when activated, current
flow when not activated
- OP: Operating Position
- FP: Free Position
- Pre-Travel: FP - OP
Applications
- Airbrakes Locked
The goal is to have current flow when the airbrakes are not closed and
locked (fully forward)
- Use a normally closed switch
at the forward (airbrakes locked) position
- Landing Gear Down and Locked
The goal is to have current flow when the landing gear is not down and
locked.
- If the switch is mounted in the gear
down and locked position then use a normally closed switch
(recommended).
- If the switch is mounted in the gear
up position then use a normally open switch.
- Flap Handle (Cruise/Climb)
The goal is to have current flow when the flap handle is in the
climb range (flaps at +1 or greater) and no current flow when the flap
handle is in the cruise region (flaps at -2, -1, 0).
Note: You may want to use a roller switch riding on a built-up area of
the flap control rod to make sure the switch is activated during the
full travel of the flap handle in the desired range.
- If the switch is mounted in the
cruise region of the flap handle's travel (flaps at -2, -1, 0) then
use a normally closed switch. (recommended)
- If the switch is mounted in the
climb region of the flap handle's travel (flaps at +1 or greater)
then use a normally open switch.
Switch Comparison
Magnetic reed sensors have some advantages and some disadvantages when
compared with the mechanical lever switches. Note that
both sensor types have moving parts - reed switches have small internal
mechanical switches which have a finite life - just like mechanical lever
switches do.
- Magnetic Reed Switch
- Advantage: Non-contact, no friction
- Disadvantage: A magnetic target
(actuator) must be mounted on the item being sensed.
- Mechanical Roller Switch
- Advantage: The switch senses the
actual item being sensed so no magnet needs to be mounted on the
item being sensed.
- Disadvantage: Mechanical contact is
required so there will be some friction in applications where the
target is moving relative to the sensor.
How to Order
To order a product, click on the
button next to the product.
When you are ready to complete your order, click on the
button.
Click on the small images to view larger versions.
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Part # |
Description |
Photo
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Price |
Lead-time |
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Switch-Lever |
Switch, Lever
This is an inexpensive, very small lever switch that can be
used to sense the position of an airbrake or flap actuator or to sense
that the landing gear is up or down and locked. It can be wired as
either normally-open (no current flow when not activated, current flow
when activated) or normally-closed (current flow when not activated, no
current flow when activated). See dimensional drawing at right for
wiring instructions. The switch is also labeled near the
connectors with "C" for common, "NO" for normally-open, and "NC" for
normally-closed. The connectors on the bottom of the switch are
"solder lugs" designed for soldering wires to.
Electrical Specifications:
• Rating: 5A/125VAC
• Insulation resistance: 100M½ > 500VDC
• Dielectric Strength: 500VAC for 1 minute
• Contact resistance: <50m½
• Life cycling (full load): 200,000 cycles
Mechanical Specifications:
• Switching timing: non-shorting
• Life cycling (no load): 1,000,000 cycles
• Operating temperature: -25°C ~ +80°C
• Operating force: 28g
• Travel: .079 in
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$4.95 |
In
Stock |
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Switch-Roller |
Switch, Roller Lever
This is an inexpensive, very small switch with roller that can be
used to sense the position of an airbrake or flap actuator or to sense
that the landing gear is up or down and locked. It can be wired as
either normally-open (no current flow when not activated, current flow
when activated) or normally-closed (current flow when not activated, no
current flow when activated). See dimensional drawing at right for
wiring instructions. The switch is also labeled near the
connectors with "C" for common, "NO" for normally-open, and "NC" for
normally-closed. The connectors on the bottom of the switch are "solder
lugs" designed for soldering wires to.
Electrical Specifications:
• Rating: 5A/125VAC
• Insulation resistance: 100M½ > 500VDC
• Dielectric Strength: 500VAC for 1 minute
• Contact resistance: <50m½
• Life cycling (full load): 200,000 cycles
Mechanical Specifications:
• Switching timing: non-shorting
• Life cycling (no load): 1,000,000 cycles
• Operating temperature: -25°C ~ +80°C
• Operating force: 30g ± 10g
• Travel: .063 in
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$4.95 |
In
Stock |
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